Improvement in steam-engine valves



UNITED STATESPA'I'ENT CEEIGE.

CHARLES I). DEANE, OF SPRINGFIELD, MASSACHUSETTS.

IMPROVEMENT IN STEAM-ENGINE VALVES.

I Specification forming part of Letters Patent No. 110,835, dated January 10, 1871.

I, CHARLES P. DEANE, of Springfield, county of Hampden, Commonwealth of Massachusetts, have invented a new and useful Improvement in Steam-Engines, of which the following is a specication:

My improvement consists in an impro ved method of cushioning pistons of steam-engines, especially applicable to the valve-pistons of direct-acting engines.

In the drawing, Figure 1 is a section of a directacting engine having my improved arrangement for cushioning the valve-piston A. Fig. 2 is an enlarged detail section of the cushioning device.

I will now describe my improvement.

B is a small slide-valve operating the valvepiston A by means of ports c d. This valvepiston A has arranged in each end a puppetvalve, g, which operates to cushion the valvepiston by closing the port c or the port d, when exhausting from their respective ends, at the same time leaving the ports c and d free for the induction of steam by removing the puppet g from its seat.

By this means I accomplish a perfect cushion, for the valve-piston closes the exhaustport by means of the puppet g, and the piston is arrested, although any pressure of steam in the port caused by the reversing of the slidevalve B removes the puppet g from its seat, and leaves the port open for the induction of steam to the end of the valve-piston.

I claim- The arrangement of thc puppet-valves upon the valve-piston A, and their operation in connection with it and with the ports c and 61,'

substantially as specied.

CHARLES P. DEANE.

Witnesses:

J. B. GARDINER, D. M. WELLS. 

